Basic version and Turbo version (differ by a number of sets performed), tier I, II, and III (difference in a number of exercises and/or sets performed in a workout), 4 days a week training, working all major muscles during a workout, but with a limited number of sets (starting with 1 in Tier 1 of the Basic version). Three major types of training: load sets (6-12 reps to failure or close), Pump sets (15-25 reps), Muscle Rounds (clusters of 6 sets x 4 reps with 10 sec in between with one failure point).
As an example, on Tier I of Basic version, Day 1 you train thigh/quad/ham/add/calf with 1 set of load sets, and chest/back, shoulders/abs, bi/tri are trained with pump supersets (1 set). Day 2: vice versa (back/chest/delts with load sets and legs with pump sets). Day 3: muscle rounds (clusters) only for thigh/quad/ham/calf, bi/forearms. Day 4: muscle rounds for back width/back thickness/chest/delts/triceps/(abs).
DC style rest-pause is incorporated for some of the tiers and/or exercises.
Progression to the next tier adds more volume in the number of sets performed.